皖浙赣相邻区晚中生代多期构造变形特征及其动力学背景

发布时间：2018-05-03 19:04

本文选题：皖浙赣相邻区 + 多期构造变形　；参考：《地学前缘》2016年04期

【摘要】：通过详细系统的野外地质调查和构造解析,文中在皖浙赣相邻区识别出晚中生代的五期构造变形。第一期为中侏罗世末到早白垩世初的北东东向逆冲-推覆构造,形成时间大约为160~150 Ma;第二期为早白垩世初的高角度正断层和北东东向左行平移断层,形成于150~135 Ma;第三期为早白垩世晚期的北北东向左行平移断层,形成于125~120 Ma;第四期为北东—北东东向右行平移断层,形成于早白垩世末期的100 Ma左右;最后一期为形成于晚白垩世早期(约75 Ma)的北北东向逆冲断层构造。区内晚中生代的多期构造变形与华南和华北板块的最后阶段的碰撞,晚中生代以来太平洋板块在不同阶段向欧亚大陆不同方向的俯冲,甚至与印度板块向北碰撞产生的向东远程挤压效应等诸多作用有关。
[Abstract]:Through systematic field geological investigation and structural analysis, the fifth tectonic deformation of late Mesozoic is identified in the adjacent areas of Anhui, Zhejiang and Jiangxi provinces. The first stage is the east-west thrust-nappe structure from the end of the Middle Jurassic to the early Cretaceous, the forming time is about 160 ~ 150 Ma.The second stage is the high-angle normal fault of the early Cretaceous and the northwest-east-to-left transposition fault. The third stage was the late early Cretaceous NNE eastward and left transposition fault, which was formed at 125 ~ 120 Ma, and the fourth period was the NE-N east-north eastward transposition fault, which was formed at about 100 Ma in the late early Cretaceous, and the third stage was formed in the late early Cretaceous, and the third phase was formed at 125 ~ 120 Ma. The last stage is a NNE thrust fault formed in the early late Cretaceous (about 75 Ma). The late Mesozoic tectonic deformation collided with the last stage of the South China and North China plates, and the Pacific plate subducted to Eurasia in different directions at different stages since the late Mesozoic. Even related to the impact of the Indian plate northward collision caused by the eastward remote squeeze effect and so on.
【作者单位】：安徽省地质调查院;中南大学地球科学与信息物理学院;安徽省地质矿产勘查局332地质队;
【基金】：安徽省公益性地质工作项目(2012-G-38) 安徽省国土资源科技项目(2015-K-5)
【分类号】：P542

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